We have some more news: About two dozen news and other organizations have signed on as beta-testers. They’ll be contributing documents to DocumentCloud, and giving us feedback as we work out the kinks. It’s a wide-ranging list:

ACLU National Security Project

Arizona Republic

The Atlantic

Center for Democracy and Technology / OpenCRS

Centre for Investigative Journalism, City University London

Center for Investigative Reporting / California Watch

Center for Public Integrity

Chicago Tribune

Dallas Morning News

The Investigative Reporting Workshop at American University

The New Yorker

NewsHour

MinnPost

MSNBC

Mother Jones

Public.Resource.Org

St. Petersburg Times

Sunlight Foundation

Voice of San Diego

Washington Post

WNYC

These organizations will be joining our original set of contributors — The New York Times, ProPublica, Talking Points Memo, The National Security Archive, and Gotham Gazette — all of whom will of course be working with us during the testing too.

Earlier this morning we also announced that we’re working with Thomson Reuters’ OpenCalais service to extract and make available information from the documents contributed to DocumentCloud.

E-mail us if you’d like to participate in the testing. We’re interested in any organization, including non-profits and academic institutions, that have obtained documents during their research.

If you’re new here, the goal of DocumentCloud is to super-charge investigations by making documents, and the information in them, easier to find and share. Readers will be able to search documents on DocumentCloud and then will be pointed to the documents themselves on contributing organizations’ Web sites. (Here’s a FAQ with more details.)

Finally, you can keep following our progress on this blog — or follow us on Twitter, or RSS. And we’re releasing our code each step of the way.